Mixing device for oil burners



July 1, 1930. I A. A. STUTZMAN 1,769,032

MIXING DEVICE FOR OIL BURNERS Filed June 1926 2 Sheets-Sheet l INVENTORJuly 1,1930. 'A.A.*STUTZMAN 1,769,082

MIXING DEVIQELFOR OIL BURNERS lip MESS WW fi Jihad -v 1 flTTOlP/VEYinregistry with theports;

Patents-elderly 1,1 19130 v v A i ALFRED srnrzrraiv, or ALIDAN,rmm:sYLvAnra MIXING nnvrcn non orr. BUBNEBS Application file d lune 9,1926; Serial No. 114,601.

My invention relates to oil burners andpar- My improved burner comprisesa suitable tic'ularly to that type designed for use in base or bed 1which is supported, as by legs 2, heating houses and'other buildings,and the at a proper elevation in front of the furnace bj f h invention it id an i not shownr but indicated partly in dotted proved apparatus ofthis character which 16 "60 Which It 8 appl ed- OU d .may'be employed inconnection with any of th1s base,preferably the endthereof re;

' the usual types of furnaces, and which is flomihe ,1 ar tary p mp to 1adapted toburn fuel oil of low specificgravthe Inlet 4 f Whl h 1S HII eda supply plpe ity so as to effect a material economyin heat-51eaCl1I1g-fr01'n the Storage tank ot shown) t for-the fuel 011.. I 50Another object of theinvention is to pro- The p l p y be o Suitable39113311191 vi'de an oil burner having improved means andiln, e P 3lnsliimce of gage! for metering the oil, which will effectually yp rShPWH 111 d comprlses regualtethe quantity used, and which is notirotolle hallng l l' genes of 11115613111 1 likely to become cloggedeven when used with 1 gear Kieth 7'mes h1ng eearrwheel Edls heav'y 11and hence maintains a d and posed ineccentric relation thereto. The geareven a 7 wheel; 1s carried by and mounted to rotate A'further obiect ofthe invention is to Profreelynn) a pm 9 Proficient m from videmeans forchecking the flow of oil when face Plate 10 of t p 1 l casing The thedevice is stopped, so as toprevent What t platealso i Web or Partltwn 12is known as flooding, which Causes Serious which 15 of substantiallycrescent shape and difficulties and often results in back firing.extends part Way around fihe giar"wheel 8 With these and other objectsin View, inand betweenthe Same and the gval teeth l The rotor iscarried-lb a shaft 13 which "is Ventfin ,gp p g vanogs H0261 fi ijournalled in, and pro iects beyond, a tubucons-m0 1011 an arrancemel-lo 6 P S lar bearing 14 extendino lon itudinally from hereinafterdescribed and claimed, and 1llusn b trated in the accom an in drawingsin the Pump caslng 011 the QPp0S1te side thereof h y i y from thefaceplatelO, the bearing being pro 1 W a v V vided at its extremity with astufing box 15 1 a longftudmal t l of to prevent possible escape of oilfromthe burner" v i interior of the pump casing. y I i 2 plan Vlewthgreof; On the rotation of the shaft 13 the pump 3 18 an enlaf'ged dsecmonal draws the fuel oil through the supply pipetherepff01111116llnegwgoiFlgaz? 5 and delivers it under pressure to afeed 35 1s a enlargedfletmled iseptlonal pipe 16 connected tothe outlet17 of the VIQW 2 t 1,1116 of showlng h pump and leading therefrom to ametering {neterlllg devlce Wlth the grooves'out o r s device 18. Locatedin the feed pipe is a re 3 h erq =j lief valve 19=which opens outwardlyto permit F g- 5 1S a 55111111211 719W Showing the grooms excess oil tobe bypassed therethrough and r escape into an overflow pipe 20 thatreturns 13 an e e 'V 1 9 it to the storage tank. The valve may he tlongl S 111 0 of the PU Pi and suitably adjusted to regulate the pressure at5 7 13 a a g transverse 8805101131 Whichit will open and thus controlthe presview of the atoniizerythe section being lien Sure ithi th f dw i16 ,1; hi h th 45 011 the line 0f g-2; n 7 oil is delivered to'th'emetering device. A

Fig 8 .iS a transverse section on the lure gauge 21, mounted on the feedpipe, indicates 11-11 of Fig. 1. the oilpressur'e. The end portion ofthe feed 7 Similar letters of reference are used to inpipe 16 connectedwith the pump 3 extends, dicate similar parts throughout therespecupwardly therefrom in substantially vertical 50 tive views. P a iposition while the intermediate portion of chamber 24 having an inlet25, with which the feed pipe 16 is connected, andan outlet 26 incommunication with a pipe 27, The

- metering chamber is divided between the inor ports.

let and outlet by a transverse partition or metering plate 28, which ispreferably clamped in position between the casing sections 22 and Themetering plate is formed with a conical seat 29 facing preferably on theinlet side thereof, and with one or more ports 30 communicating bothwith such seat and with the metering chamber on the outlet side of theplate. In the present instance there are two of these ports which arearranged diametrically opposite each other. Fitting within the seat 29is a conical head 31 provided at one end of ametering plunger 32 andformed in its periphery with longitudinal grooves 33 preferablycorresponding in number and relative position. with the ports 30, so asto intermittently register therewith as the head is rotated on its seatto permit smallquantities of oil to escape through the metering plate28. It is to be noted that the grooves flare gradually, orincreaseinwidth, from the base of the conical head to the apex thereof, whilethe ports 30 are of a diameter preferably slightly greater than thewidth of the grooves at the point of registry. This prevents possibleclogging of the metering device even when heavy oil is used, and causesthe device to clear itself if any solid matter in the oil tends tobecome lodged in the grooves The amount of fuel oil flowing through themetering device is regulated-by interchanging metering plates havingdifferent sized ports and plungers having different sized grooves, or byregulating the relief valve 19 to vary the pressure under'which the oilis delivered to the metering device.-

'The plunger 32 extends longitudinally of the metering chamber ith itsend portion remote from the head 31, telescoping with a spindle 34, andreceived in a longitudinal socket 35 in the adjacent end thereof. A pin36 passes transversely through the plunger and has longitudinal play inslots 37 extending outwardly through the spindle on opposite sides ofthe socket 35, whereby tapermit theplunger to move longitudinallyindependently of the spindle, but to hold such parts against anyrelative turning movement. A coiled expansion spring 88 is locatedwithin the socket and exerts a longitudinal thrust on the plunger tohold the head 31 against its seat. The spindle, 34 is jourthat this pinprojects into the latter.

nalled in a bearing 39 in the casing section 22 and terminates at itsother end in'a disk 40 provided with an outstanding eccentric pin 41 bymeans of which the spindle is rotated as hereinafter set forth. Toprevent leakage through the bearing 39 a stuffing box 42 is preferablymounted therein around the spindle and has alock nut 43 by which it isretained in position. a

The oil discharged through the metering plate is no longer under pumppressure and flows through the outlet 26 of the metering chamber andinto the pipe 27. This pipe extends horizontally from the meteringdevice and then upwardly to a height above the hori-' zontalintermediate portion of the feed pipe 16 and thence horizontally toconnect with a stand pipe 44, open at its upper end to the at-.mosphere, and connected at its lower end with the inlet- 45 of a rotaryatomizer 46;

The oil rises in and fills the pipe27, flowing along theupper'horizontal portion thereof, and overflowing into, and droppingdown, the stand pipe 44 so that air and oil are fed together into theatomizer.

It is to be particularly noted that the feed pipe 16 and the pipe 27 areso arranged that their adjacent portions provide a substantiallyUfshaped trap, with the metering device located in the base or centralportion thereohone leg of the trap being constituted by the vertncalportion of the pipe 27 and the other leg by the adjacent verticalportion of the pipe 16,'and the former extending somewhatabove thelatter. important in case the. apparatus should be stopped with thegrooves 33 in registry with the ports 30, and prevents an excess of oilescaping in that instance into the pipe 27 and flooding the stand pipe44. of the device the pressure created by the pump 3 is quickly lost andif the metering device is in open position the oil tends to find itslevel in the trap under substantially atmosphcric pressure.

The atomizer 46 is in the form of a rotary air compressor of anysuitable type and preferably comprises a rotor 47 mounted eccentricallywithin the casing 48 and provided with a plurality of wings or, blades49 sliding in slots 50 of the rotor. As shown the slots extenddiametrically through the rotor and each contains a pair of blades,between the inner ends'ofwhich are interposed coiled expansion springs51, which project ClKQOU'GBI ends of the blades beyond the peripl crythe rotor and against the ini er surface of the casing. One of theseblades formed in a side edge with a recess 52, adapted to receive theeccentricpin 41 of the spindle 34-, the casing section of the meteringdevice being so united with the casing 48 of the atomizer A driv ingconnection is thus providedbetween the rotor 47 and the spindle 34whereby to cause This arrangement is On the stopping supports theatomizer the metering device to be operated from, and

simultaneously with, the atomizer. V 3 Therotor a? is carried by a shaft53 journailed ina tubular bearing fig-extending longitudinally from theatomizer casing 48 on the opposite side thereof from the meteringdevice, theshaft projecti-ng through and beyond ajstuiling b O X 55 attheouter'endofthe bearing; The bearing 54 is held in, a pillow block'56which islocated. on the base 1 and forced out under pressure through theoutlet 57 of the atomizer in the form of an atomized mixture in whichthe oil hasbeen broken up v into minute particles insuspension in theair.

Beyond the outlet 57, andb-etween the same and the inlet 45 of theatomizer, aidrip pipe 58 v 'is connected to, and communicates with, the

- interior of the casing 48, and provides an escape for any oil whichhas not been atomized, and still remains in a liquid state, the drippipe extending downwardly and'thence substantially horizontally, andconnecting with the overflow pipe 20 so as'to drain intothe same andreturn theoil'tothe storageitank.

The. drip pipe is provided with a vent 59,

open, to the atmosphere, in order to prevent the drip pipe from creatinga suction within the casing-48, which would tend to retard,or

impose a drag on, the atomizer. l

The outlet 57 discharges "into a delivery pipe 60, which is preferablyprovided with a pressure gage 61, and is preferablyinclined downwardly,projecting beyond the basel and communicating with a nozzle member 62,arranged 1n sultable relatlon to the combustion a tapered seat facing onone side thereof chamber of the furnace. V

The ends of the shafts 13 and 53, projecting beyond the stutlingboxes'loand 55, respectively, are suitably coupled together as by atransverse pin 75,1driven through the shaft 13 with its ends seated inrecesses 7 6 in the hub 77 of a driving wheel 7 8 fixed on the shaft 53.-Power is suitably applied, to this driv ing wheel as by a belt 79driven by a'n electric motor 80 mounted on the base 1. The

shafts 13 and 53, and the spindle 3 4,are all disposed in longitudinalalignment, and be ing coupled together,form in effect a. single shaftextending lengthwise of the device, and

serving to directly and simultaneously operate the pump, meteringdevice, and atomizer, with the moving parts "all revolving on the sameaxis. This makes for simplicity and elliciency, and reducesfriction andnoise in operation.

The operation of my improved oil burning apparatus, whensthe. power isapplied, will be obvious in new of'theforegoing description. It will beseen thatI have provided an apparatus which is simple and compact inconstruction which ma pens'ively manufactured andeasily installed forusein connection-with anyof the usual;

types-of furnaces; which consists of-few parts andis not likely to getout of order;

which is efficient, safe, and positive in oper- "ationyand which isadapted-to burn heavy oils and thus 'nomicalbasis; I A, 1 1 Having thusdescribed my invention, I

be'readily and inexproduce heat on ajvery ecoclaiman'd desire to protectLetters- Pat;

'ent-of-*-the United State's: i V y y i h 1.'Infari oil burningapparatus, theeombination of a rotaryair compressor, an air intake pipeconnectedthereto at its low'er a metering device, means including arotary pumpfforsupp'lying liquid fuel -thereto,fand I a pipe extendingupwardly fromthe metering device and communicating-"with and ar I.pressor and a rotary metering device, all coup-y ledtogether forsimultaneous rotation, and

means for conducting liquid fuel from the-c pumpto the metering deviceand from the including a trap located between the metering device andsaid compressor and open to the atmosphere.

3. In an oil burning apparatus, the commetering device to thecompressor, said means 7 bination of a casing having a metering chamherand an inlet and an outlet therefor, a metering plate dividing saidchamber between said inlet and outlet and formed with and with a portcommunicating both with I said seat and with saidchamber on the otherSide of d p ate, a rotory metering plunger 1 having a tapered headfitting said seat and formed in its periphery with a groovewhich 1s incontinuous comunlcation wlthsaid chamher and is adapted in the rotationof the pluni ger'to register intermittentlywith said port,

and means for pressing the head against said seat, i j

4c.v In an oil burning apparatus, the combinatlon of a casing havlng ametering chamber and an, inlet and an outlet therefor, a metering platedividing said chamber between said seat facing on one side thereof andwith s a port communicating both with said seat and with'said chamber onthe other side'of said plate, and alcontinually rotating meteringplunger having a tapered head fitting said seat and formed in itsperiphery witha 10a gitudinal groove adapted toregister with said port,said groove being flared toward said port.

so end and; open at all times to the atmosphere, v

inlet and outlet andfo'rmed with a tapered f In an: oilburninglapparatus the combination of acasing having a metering chamherand aninlet and an outlet, a metering plate dividing said chamberbetween said inlet and outlet andformedwitha tapered seat facing on oneside thereof and with import a s communicatingboth with said seat andwith said chamber on theother side of said late,-a.

continually rotating metering plunger aving' j a tapered headfittingsaidseat and formed I v in :its periphery with a longitudinal grooveadapted to register withsaid port, aspindle i i Z journalled in saidcasing land telescoping Withsai'd plunger,-means for-holding saidspindle and said plunger against relative turning lmovement and yieldingmeans between said spindle and said plunger for exertnameto this inglongitudinal thrust on the latter to the head against its seat.

In testimony whereof specification. ALFRED A.

press I have signed 7 v STUTZMAN;

